Ink cartridge



FIG. 1 is a perspective view of an ink cartridge;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right-side view thereof; and,

FIG. 5 is a rear view thereof.

The broken lines are for illustrative purposes only and do not form part of the claimed design. 

The ornamental design for an ink cartridge, as shown and described. 